from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Protrusion of a part of an intervertebral disk through the fibrocartilage, occurring usually in the lower lumbar region and often causing back pain or sciatica.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A vertebral disk that protrudes into the spinal canal, exerting pressure on spinal nerves and causing backache or sciatica.


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